The inventor's universal educator : An educational cyclopaedia and guide for inventors, patentees, manufacturers, mechanics and all others connected directly or indirectly with patents
A 1906 reference cyclopaedia compiled by Fred G. Dieterich in Washington, D.C., explaining patent law and mechanical movements to inventors, patentees, manufacturers and mechanics. The plates are numbered line diagrams of gears, cams, levers, water wheels, weights and perpetual-motion schemes, drawn in thin outline with letter keys — usable as grids of small technical motifs or single mechanism vignettes.
